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MELSEC-Q
4 WHEN THE QCPU ACCESSES THE OTHER STATION PLC USING THE
DATA LINK INSTRUCTION
(b) When abnormal completion
1) READ instruction, SREAD instruction
Channel 1
0
END
Sequence scan
0
END
0
END
0
END
0
END
Read command
READ
1 scan
Read completion device
(Device designated with (D2))
Local station
QCPU
Read completion device
((D2)+1 device)
Ethernet
module
?
Completion status
((S1)+1 device)
Error code
Target
station error
2) WRITE instruction, SWRITE instruction
Channel 1
0
END
Sequence scan
0
END
0
END
0
END
0
END
Write command
WRITE
1 scan
Write completion device
(Device designated with (D2))
Local station
QCPU
Write completion device
((D2)+1 device)
Ethernet
module
?
Completion status
((S1)+1 device)
Error code
Target
station error
3000
Write data storage device
(Device designated with (S2))
